The bar chart shows how the area of the ozone hole over Antarctica has changed. 25
20
8915
average size of ozone hole
(million square kilometers)
5
Lili
10
5
0
1980 1990 2000 2012
year
a.
b.
Calculate the increase in its size between 1980 and 2000. (2mks)
Describe what has happened to the hole since the year 2000. (2mks)
Suggest a reason for this.
(2 mks)
C.

1. the passing of is the basis of heredity. 2. our encode the instructions that define our traits. 3. each of us has thousands of genes, which are made of and reside in our chromosomes. 4. in addition to our genes, the we live in also define our traits. 5. humans have two complete sets of chromosomes. 6. when parents conceive a child, each parent contributes set of chromosomes. 7. every child receives of its chromosomes from the mother and half from the father. 8. this transfer takes place at when the father’s sperm joins the mother’s egg. 9. while most cells in our bodies have two sets of chromosomes, or a total of egg and sperm each have chromosomes. 10. when egg and sperm unite they create a single cell called a 11. each parent contributes complete set of chromosomes to their child. 12. since the parents contribute the chromosomes to each new child, every child inherits a unique set of chromosomes. 13. as a result, every baby will have a combination of traits.

Which of the following statements most accurately describes convergent evolution? the process in which two similar species evolve separately from each other and share similar characteristics the process in which a single species evolves into two or more new species the process in which two entirely different species evolve in response to each other the process in which two different species evolve separately from each other but still share similar characteristics

Plsss > .< compare and contrast the characteristics of flatworms rounds worms and earthworms